Finding the Fourth Proportional to 2,081.45, 3,120.13 and 1,039.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.45 : 3,120.13 = 1,039.89 : x
2. Step 2: Convert to fraction form
   2,081.45/3,120.13 = 1,039.89/x
3. Step 3: Cross multiply
   2,081.45x = 3,120.13 × 1,039.89
4. Step 4: Simplify right side
   2,081.45x = 3,244,591.99
5. Step 5: Solve for x
   x = 3,244,591.99/2,081.45
6. Step 6: Final answer
   x = 1,558.81